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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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RELATIONSHIPS BETWEEN ACCELEROMETER-ASSESSED PHYSICAL ACTIVITY AND HEALTH IN CHILDREN: IMPACT OF THE ACTIVITY-INTENSITY CLASSIFICATION METHOD |
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Michelle R. Stone  ,
Ann V. Rowlands and Roger G. Eston |
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School of Sport and Health Sciences, University of Exeter, Exeter, Devon, UK. |
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© Journal of Sports Science and Medicine (2009) 8, 136 - 143 Search Google Scholar for Citing Articles |
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| ABSTRACT | |||
| It is unknown whether relationships detected between physical
activity intensity and health differ according to accelerometer thresholds
used [sample-specific thresholds (SSTs), published thresholds (PTs) or the
individualized activity-related time equivalent (ArteACC)]. SSTs were developed
through ActiGraph calibration in 52 boys, aged 8-10 years. The boys subsequently
wore an ActiGraph for seven days. SSTs, PTs and ArteACC for moderate (MPA)
and vigorous (VPA) activity were applied. Waist circumference (WC), peak
oxygen consumption (VO2peak) and blood pressure were assessed.
After applying SSTs, 48.9% of boys achieved 60+ minutes of daily MVPA, compared
with 8.5% with PTs and 100% with ArteACC. MPA and VPA were correlated with
WC and VO2peak, regardless of whether PTs or SSTs were used (WC:
MPA r = -0.37 to -0.43; VO2peak: r = 0.34 to 0.39, p < 0.05).
With ArteACC, only VPA was correlated with WC (r = -0.39, p < 0.01) and
VO2peak (r = 0.35, p < 0.05). Relationships with blood pressure
were statistically non-significant. Although estimates of the quantity of
activity differed according to thresholds used, relationships detected with
health were consistent regardless of whether SSTs or PTs were employed.
There was no advantage of using SSTs or individualized thresholds. Researchers
are encouraged to use PTs to ensure greater comparability between studies.
Key words: ActiGraph, activity guidelines, MVPA, thresholds. |
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